i2pd/client/i2pcontrol/I2PControlServer.cpp

#include "I2PControlServer.h"
#include <sstream>
#include <boost/date_time/local_time/local_time.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include "util/Log.h"
#include "util/Timestamp.h"
#include "version.h"

namespace i2p {
namespace client {

I2PControlService::I2PControlService(const std::string& address, int port, const std::string& pass)
    : m_Session(std::make_shared<I2PControlSession>(m_Service, pass)),
      m_IsRunning(false), m_Thread(nullptr),
      m_Acceptor(m_Service, boost::asio::ip::tcp::endpoint(
        boost::asio::ip::address::from_string(address), port)
      )
{

}

I2PControlService::~I2PControlService()
{
    Stop();
}

void I2PControlService::Start()
{
    if(!m_IsRunning) {
        Accept();
        m_Session->start();
        m_IsRunning = true;
        m_Thread = new std::thread(std::bind(&I2PControlService::Run, this));
    }
}

void I2PControlService::Stop()
{
    if(m_IsRunning) {
        m_IsRunning = false;
        m_Acceptor.cancel();   
        m_Session->stop();
        // Release ownership before the io_service is stopped and destroyed
        m_Session.reset();
        m_Service.stop();
        if(m_Thread)
        {   
            m_Thread->join(); 
            delete m_Thread;
            m_Thread = nullptr;
        }   
    }
}

void I2PControlService::Run() 
{ 
    while(m_IsRunning) {
        try {   
            m_Service.run();
        } catch(const std::exception& ex) {
            LogPrint(eLogError, "I2PControl: ", ex.what());
        }   
    }   
}

void I2PControlService::Accept()
{
    auto newSocket = std::make_shared<boost::asio::ip::tcp::socket>(m_Service);
    m_Acceptor.async_accept(*newSocket, std::bind(&I2PControlService::HandleAccept, this,
        std::placeholders::_1, newSocket));
}

void I2PControlService::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
    if(ecode != boost::asio::error::operation_aborted)
        Accept();

    if(!ecode)
    {
        LogPrint(eLogInfo, "New I2PControl request from ", socket->remote_endpoint());
        std::this_thread::sleep_for(std::chrono::milliseconds(5));
        ReadRequest(socket);   
    }
    else
        LogPrint(eLogError, "I2PControl accept error: ",  ecode.message());
}

void I2PControlService::ReadRequest(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
{
    auto request = std::make_shared<I2PControlBuffer>();
    socket->async_read_some(
#if BOOST_VERSION >= 104900
        boost::asio::buffer(*request),  
#else
        boost::asio::buffer(request->data(), request->size()), 
#endif              
        std::bind(&I2PControlService::HandleRequestReceived, this, 
        std::placeholders::_1, std::placeholders::_2, socket, request));
}

void I2PControlService::HandleRequestReceived(const boost::system::error_code& ecode,
    size_t bytes_transferred, std::shared_ptr<boost::asio::ip::tcp::socket> socket, 
    std::shared_ptr<I2PControlBuffer> buf)
{
    if(ecode) {
        LogPrint(eLogError, "I2PControl read error: ", ecode.message());
        return;
    }

    try {
        bool isHtml = !memcmp(buf->data(), "POST", 4);
        std::stringstream ss;
        ss.write(buf->data(), bytes_transferred);
        if(isHtml) {
            std::string header;
            while(!ss.eof() && header != "\r")
                std::getline(ss, header);
            if(ss.eof()) {
                LogPrint(eLogError, "Malformed I2PControl request. HTTP header expected");
                return; // TODO:
            }
        }

        I2PControlSession::Response response = m_Session->handleRequest(ss);
        SendResponse(socket, buf, response.toJsonString(), isHtml);
    } catch(const std::exception& ex) {
        LogPrint(eLogError, "I2PControl handle request: ", ex.what());
    } catch(...) {
        LogPrint(eLogError, "I2PControl handle request unknown exception");
    }
}

void I2PControlService::SendResponse(std::shared_ptr<boost::asio::ip::tcp::socket> socket,
    std::shared_ptr<I2PControlBuffer> buf, const std::string& response, bool isHtml)
{
    size_t len = response.length(), offset = 0;
    if(isHtml) {
        std::ostringstream header;
        header << "HTTP/1.1 200 OK\r\n";
        header << "Connection: close\r\n";
        header << "Content-Length: " << boost::lexical_cast<std::string>(len) << "\r\n";
        header << "Content-Type: application/json\r\n";
        header << "Date: ";
        auto facet = new boost::local_time::local_time_facet("%a, %d %b %Y %H:%M:%S GMT");
        header.imbue(std::locale(header.getloc(), facet));
        header << boost::posix_time::second_clock::local_time() << "\r\n"; 
        header << "\r\n";
        offset = header.str().size();
        memcpy(buf->data(), header.str().c_str(), offset);
    }   
    memcpy(buf->data() + offset, response.c_str(), len);
    boost::asio::async_write(
        *socket, boost::asio::buffer(buf->data(), offset + len), 
        boost::asio::transfer_all(), std::bind(
            &I2PControlService::HandleResponseSent, this, 
            std::placeholders::_1, std::placeholders::_2, socket, buf
        )
    );
}

void I2PControlService::HandleResponseSent(const boost::system::error_code& ecode, std::size_t bytes_transferred,
    std::shared_ptr<boost::asio::ip::tcp::socket> socket, std::shared_ptr<I2PControlBuffer> buf)
{
    if(ecode)
        LogPrint(eLogError, "I2PControl write error: ", ecode.message());
    socket->close();
}

}
}